<template>
    <view>
        <view id="_drag_button" class="drag" :style="'left: ' + left + 'px; top:' + top + 'px;'"
            @touchstart="touchstart" @touchmove.stop.prevent="touchmove" @touchend="touchend"
            @click.stop.prevent="click" :class="{ transition: isDock && !isMove }">
            <image src='../../static/qrCodeIcon.png' mode="scaleToFill"></image>
        </view>
    </view>
</template>

<script>
import { wxCode } from '../../utils/http';

export default {
    name: 'drag-button',
    props: {
        isDock: {
            type: Boolean,
            default: false
        },
        existTabBar: {
            type: Boolean,
            default: false
        },
    },

    data() {
        return {
            config: getApp().globalData.config, //全局获取
            top: 0,
            left: 0,
            width: 0,
            height: 0,
            offsetWidth: 0,
            offsetHeight: 0,
            windowWidth: 0,
            windowHeight: 0,
            isMove: true,
            edge: 10,
            value: 0
            // imgOne: '../static/dd%20(2).png',
        }
    },
    mounted() {
        const sys = uni.getSystemInfoSync();

        this.windowWidth = sys.windowWidth;
        this.windowHeight = sys.windowHeight;

        // #ifdef APP-PLUS
        this.existTabBar && (this.windowHeight -= 50);
        // #endif
        if (sys.windowTop) {
            this.windowHeight += sys.windowTop;
        }
        const query = uni.createSelectorQuery().in(this);
        query.select('#_drag_button').boundingClientRect(data => {
            this.width = data.width;
            this.height = data.height;
            this.offsetWidth = data.width / 2;
            this.offsetHeight = data.height / 2;
            this.left = this.windowWidth - this.width - this.edge;
            this.top = this.windowHeight - this.height - this.edge - 500;
        }).exec();
    },
    methods: {
        // 业务代码
        click() {
            this.$emit('newAdd');
            console.log(1);
            wx.navigateTo({
                url:'../../packageOrder/myCode/myCode'
            })
        },
        touchstart(e) {
            // this.$emit('btnTouchstart');
        },
        touchmove(e) {
            // 单指触摸
            if (e.touches.length !== 1) {
                return false;
            }

            this.isMove = true;
            this.left = e.touches[0].clientX - this.offsetWidth;
            let clientY = e.touches[0].clientY - this.offsetHeight;
            // #ifdef H5
            clientY += this.height;
            // #endif
            let edgeBottom = this.windowHeight - this.height - this.edge;

            // 上下触及边界
            if (clientY < this.edge) {
                this.top = this.edge;
            } else if (clientY > edgeBottom) {
                this.top = edgeBottom;
            } else {
                this.top = clientY
            }

        },
        touchend(e) {
            if (this.isDock) {
                let edgeRigth = this.windowWidth - this.width - this.edge;

                if (this.left < this.windowWidth / 2 - this.offsetWidth) {
                    this.left = this.edge;
                } else {
                    this.left = edgeRigth;
                }

            }

            this.isMove = false;
        },
    }
}
</script>

<style lang="scss">
.drag {
    display: flex;
    justify-content: center;
    align-items: center;
    color: $uni-text-color-inverse;
    width: 100rpx;
    height: 100rpx;
    border-radius: 50%;
    font-size: $uni-font-size-sm;
    position: fixed;
    z-index: 999999;

    &.transition {
        transition: left .3s ease, top .3s ease;
    }

    image {
        width: 100%;
        height: 100%;
    }
}
</style>